小编zba*_*zba的帖子

我在尝试使用camera2 api从CameraManager实例获取相机ID列表时收到此错误消息：

UnhandledException：android.hardware.camera2.CameraAccessException

这是我的代码

    CameraManager manager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
    String cameraId = manager.getCameraIdList()[0];

我在第二行收到错误消息。我已经在清单中设置了相机权限，甚至确保我的物理手机已打开、连接并设置为开发人员模式（尽管我认为这不会产生任何影响），但想不出其他任何事情这与我在网上看到的所有简单示例不同。

下面是完整的 MainActivity 代码：

任何建议表示赞赏...

import android.content.Context;
import android.content.pm.PackageManager;
import android.hardware.camera2.CameraManager;
import android.hardware.camera2.CameraAccessException;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.internal.app.ToolbarActionBar;
import android.support.v7.widget.CardView;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Toolbar;

import com.google.zxing.integration.android.IntentIntegrator;

import org.joda.time.DateTime;

import java.util.ArrayList;
import java.util.List;

import Model.Consumer;
import Model.Plan;
import Model.Product;
import Model.ProductInfo;
import Model.Retailer;
import Model.Transaction;


public class MainActivity extends AppCompatActivity {

private android.support.v7.widget.Toolbar toolbar;

private RecyclerView recList; …

研究没有结果,因为对这个错误的所有其他引用似乎都是可靠的可重复的; 我无法一直重复此错误:

08-22 17:32:25.216  22699-22699/com.smbds.punisher11 E/AndroidRuntime? FATAL EXCEPTION: main
    java.lang.IllegalArgumentException: width and height must be > 0
            at android.graphics.Bitmap.createBitmap(Bitmap.java:1023)
            at android.graphics.Bitmap.createBitmap(Bitmap.java:1002)
            at android.graphics.Bitmap.createBitmap(Bitmap.java:985)
            at com.github.amlcurran.showcaseview.ShowcaseView.updateBitmap(ShowcaseView.java:171)
            at com.github.amlcurran.showcaseview.ShowcaseView.onGlobalLayout(ShowcaseView.java:354)
            at android.view.ViewTreeObserver.dispatchOnGlobalLayout(ViewTreeObserver.java:655)
            at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2054)
            at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1190)
            at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4860)
            at android.view.Choreographer$CallbackRecord.run(Choreographer.java:766)
            at android.view.Choreographer.doCallbacks(Choreographer.java:575)
            at android.view.Choreographer.doFrame(Choreographer.java:542)
            at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:751)
            at android.os.Handler.handleCallback(Handler.java:725)
            at android.os.Handler.dispatchMessage(Handler.java:92)
            at android.os.Looper.loop(Looper.java:158)
            at android.app.ActivityThread.main(ActivityThread.java:5751)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1083)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:850)
            at dalvik.system.NativeStart.main(Native Method)

如上所述,此错误不会一直发生.它似乎发生了(但不完全是)2-3次,然后2-3次运行没有问题.

这是我的资源文件:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/container_fragment_person_list"
    android:tag="PersonListFragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".fragments.PersonListFragment">

    <TextView
        android:id="@+id/textView_add_guardian_placeholder" …